On 11/4/13, ZyX <[email protected]> wrote:
>> This means in Vim 7.4 Vim script stops after a Vim error occurs in
>> Python code. This seems very wrong to me. Vim script writers are used
>> to the fact that VimL code execution does not stop after an error
>> unless there is a try/catch or when function has "abort" argument.
>
> Code that relies on this is broken. No matter how is some functionality used
> it *can* be put inside try/catch by the user*. I already got a few “nice” to
> debug bugs when was assuming `echoerr` is not breaking execution flaw (note:
> without any traces of python). Now they will be easier to fix: now when I
> see `echoerr` I say I must remove it.
>
> For echoing errors from python there is `sys.stderr`.
>
> Besides, any error shown to user indicates a bug.
>
> *:
>
> - Any command and function can be naturally put inside :try/catch in a
> script.
> - Any mapping can be called with :normal that can be put inside :try/catch.
> - Any autocommand can be called either directly with :doau inside :try/catch
> or by putting commands that invoke autocommand inside :try/catch (i.e. :e
> for BufRead*).
>
> There is no way write code that will never stop execution on error without
> using :silent! or :try/catch catching the error on your own. Hence any error
> must be considered to break execution. Any code that considers error not
> breaking execution is broken.
All this is true in theory. In practice, nobody ever puts the entire
Vim script plugin inside try/finally/endtry. The simplest case:
let s:keepcpo= &cpo
set cpo&vim
echo 1
let a = bogus
echo 2
python a = bogus
echo 3
python vim.command("let a=bogus")
" execution stops here
echo 4
let &cpo= s:keepcpo
unlet s:keepcpo
When such script is sourced, execution does not stop after a Vim
script error or a regular Python error. Why should it stop after a
Python vim.error error? This is an inconsistent behavior of Vim error
handling that is bound to cause confusion.
Regards,
Vlad
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